/*
** $Id: lctype.h,v 1.12 2011/07/15 12:50:29 roberto Exp $
** 'ctype' functions for Lua
** See Copyright Notice in lua.h
*/

#ifndef lctype_h
#define lctype_h

#include "lua.h"


/*
** WARNING: the functions defined here do not necessarily correspond
** to the similar functions in the standard C ctype.h. They are
** optimized for the specific needs of Lua
*/

#if !defined(LUA_USE_CTYPE)

    #if 'A' == 65 && '0' == 48
        /* ASCII case: can use its own tables; faster and fixed */
        #define LUA_USE_CTYPE   0
    #else
        /* must use standard C ctype */
        #define LUA_USE_CTYPE   1
    #endif

#endif


#if !LUA_USE_CTYPE  /* { */

    #include <limits.h>

    #include "llimits.h"


    #define ALPHABIT    0
    #define DIGITBIT    1
    #define PRINTBIT    2
    #define SPACEBIT    3
    #define XDIGITBIT   4


    #define MASK(B)     (1 << (B))


    /*
    ** add 1 to char to allow index -1 (EOZ)
    */
    #define testprop(c,p)   (luai_ctype_[(c)+1] & (p))

    /*
    ** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
    */
    #define lislalpha(c)    testprop(c, MASK(ALPHABIT))
    #define lislalnum(c)    testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
    #define lisdigit(c) testprop(c, MASK(DIGITBIT))
    #define lisspace(c) testprop(c, MASK(SPACEBIT))
    #define lisprint(c) testprop(c, MASK(PRINTBIT))
    #define lisxdigit(c)    testprop(c, MASK(XDIGITBIT))

    /*
    ** this 'ltolower' only works for alphabetic characters
    */
    #define ltolower(c) ((c) | ('A' ^ 'a'))


    /* two more entries for 0 and -1 (EOZ) */
    LUAI_DDEC const lu_byte luai_ctype_[UCHAR_MAX + 2];


#else           /* }{ */

    /*
    ** use standard C ctypes
    */

    #include <ctype.h>


    #define lislalpha(c)    (isalpha(c) || (c) == '_')
    #define lislalnum(c)    (isalnum(c) || (c) == '_')
    #define lisdigit(c) (isdigit(c))
    #define lisspace(c) (isspace(c))
    #define lisprint(c) (isprint(c))
    #define lisxdigit(c)    (isxdigit(c))

    #define ltolower(c) (tolower(c))

#endif          /* } */

#endif

